Downers are known to cause headaches, feelings of sadness and a weak pulse.

镇静剂据悉可以引起头痛，伤感和脉搏虚弱。

My partner found a very weak pulse while I was bagging.

在我用呼吸气囊时，我的搭档发现脉搏很弱。

There was a strong, sharp peak of emission lasting less than a second, followed by a longer, weaker pulse lasting for several more seconds.

出现了一个持续不到一秒的强烈、尖锐的发射峰值，接着是一个持续数秒的较长、较弱的脉冲。